# Lego Battles: a hand-decompiled Nintendo DS reconstruction

> Lego Battles reconstructs Nintendo DS game source through manual decompilation, chiefly targeting the European version. Its build combines recovered C/C++ code with assets extracted from the user's ROM; an optional ARM7 BIOS enables a matching ROM build.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/LiruJ/Lego-Battles-Decomp>
- Primary source: <https://github.com/LiruJ/Lego-Battles-Decomp/blob/d9f2b809b08c85077847f046827fc508e6962453/README.md>
- Catalog page: <https://awesomerea.org/resources/lego-battles-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/lego-battles-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/lego-battles-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** An original decrypted Lego Battles ROM is required for asset extraction.
- **Prerequisites:** Python 3.11+, GCC 9+ and Ninja are documented build prerequisites.
- **Prerequisites:** An ARM7 BIOS dump is needed for the optional matching ROM build.
- **License:** CC0 1.0 Universal license.

## Primary sources

1. <https://github.com/LiruJ/Lego-Battles-Decomp/blob/d9f2b809b08c85077847f046827fc508e6962453/README.md>
2. <https://github.com/LiruJ/Lego-Battles-Decomp/blob/d9f2b809b08c85077847f046827fc508e6962453/INSTALL.md>

## More in Games

- [Lego Island 2: GBA decompilation](https://awesomerea.org/resources/lego-island-2-gba-case/index.md) · Case study
- [LEGO Racers: an N64 source reconstruction in progress](https://awesomerea.org/resources/lego-racers-case/index.md) · Case study
- [LEGO Rock Raiders: a C and C++ decompilation project](https://awesomerea.org/resources/lego-rock-raiders-decompile-case/index.md) · Case study
- [libmkb: reconstructing Super Monkey Ball 2 systems as a C++ library](https://awesomerea.org/resources/libmkb-case/index.md) · Case study
- [LibreGrimrock: 64-bit reconstructions of the Legend of Grimrock engines](https://awesomerea.org/resources/libregrimrock-case/index.md) · Case study
- [Little King's Story: a Wii decompilation project](https://awesomerea.org/resources/little-kings-story-decomp-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.